SYSTEM AND METHOD FOR CONTENTS USE AUTHORITY CONTROL, INFORMATION PROCESSING DEVICE, AND COMPUTER PROGRAM

摘要

PROBLEM TO BE SOLVED: To realize a system capable of upgrading contents use conditions by eliminating the need of the contents use authority control by users on a service provider side. SOLUTION: In this system, enciphered contents are distributed, and the use of the contents is allowed by only formal users. A service provider receives a contents use authority certificate from the users, acquires the user information and the contents purchase information of the users from the contents use authority certificate on conditions that it is confirmed by the verification of the electronic signature of the issue entity of the contents use authority certificate that data is not tampered, and the upgrade processing of use condition alteration is performed. Thus a contents use condition alteration processing can be performed even if the service provider side does not have user control data.